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A two-step microwave precalcination-sintering method for strengthening the performance of composite refractory materials

A refractory material and microwave sintering technology, applied in the field of refractory materials, can solve the problems of excessive volume expansion, deterioration of the compactness, strength and slag resistance of complex refractory materials, no advantages in refractoriness and thermal shock resistance, etc. The effect of reaction rate, expansion of application range and service life, and comprehensive performance optimization

Active Publication Date: 2022-03-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, excessive volume expansion will inevitably occur during the formation of spinel, which will deteriorate the compactness, strength and slag resistance of composite refractories.
In order to avoid low-density refractory materials, the spinel-containing refractory materials produced by the existing technology usually reduce the content of spinel, but the refractory materials prepared by this method have no advantages in refractoriness and thermal shock resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Mix ferronickel slag, sintered magnesia and chromium trioxide fine powder evenly to obtain a mixture, press it under the action of magnesium chloride solution to form a green mass, after drying, put the green mass into a microwave reactor for pre-calcination to obtain a pre-calcined billet , and then continue to sinter the pre-calcined body in a microwave reactor to obtain forsterite-spinel composite refractories.

[0088] 90% or more of the particle diameters of the ferronickel slag and sintered magnesia fine powder are <0.088mm.

[0089] The added amount of sintered magnesia is 20wt.% of the mass of ferronickel slag, and the added amount of dichromium trioxide is 2wt.% of the total mass of ferronickel slag and sintered magnesia.

[0090] The concentration of described magnesium chloride solution is 1.3g / cm 3 .

[0091] The press molding pressure is 150MPa.

[0092] The drying temperature is 100° C., and the drying time is 2 hours.

[0093] The pre-calcination temp...

Embodiment 2

[0097] Mix ferronickel slag, sintered magnesia and chromium trioxide fine powder evenly to obtain a mixture, press it under the action of magnesium chloride solution to form a green mass, after drying, put the green mass into a microwave reactor for pre-calcination to obtain a pre-calcined billet , and then continue to sinter the pre-calcined body in a microwave reactor to obtain forsterite-spinel composite refractories.

[0098] 90% or more of the particle diameters of the ferronickel slag and sintered magnesia fine powder are <0.088mm.

[0099] The added amount of sintered magnesia is 25wt.% of the mass of ferronickel slag, and the added amount of dichromium trioxide is 4wt.% of the total mass of ferronickel slag and sintered magnesia.

[0100] The concentration of described magnesium chloride solution is 1.3g / cm 3 .

[0101] The press molding pressure is 200MPa.

[0102] The drying temperature is 110° C., and the drying time is 2 hours.

[0103] The pre-calcination temp...

Embodiment 3

[0107] Mix ferronickel slag, sintered magnesia and chromium trioxide fine powder evenly to obtain a mixture, press it under the action of magnesium chloride solution to form a green mass, after drying, put the green mass into a microwave reactor for pre-calcination to obtain a pre-calcined billet , and then continue to sinter the pre-calcined body in a microwave reactor to obtain forsterite-spinel composite refractories.

[0108] 90% or more of the particle diameters of the ferronickel slag and sintered magnesia fine powder are <0.088mm.

[0109] The added amount of sintered magnesia is 30wt.% of the mass of ferronickel slag, and the added amount of dichromium trioxide is 6wt.% of the total mass of ferronickel slag and sintered magnesia.

[0110] The concentration of described magnesium chloride solution is 1.3g / cm 3 .

[0111] The press molding pressure is 250MPa.

[0112] The drying temperature is 110° C., and the drying time is 3 hours.

[0113] The pre-calcination temp...

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Abstract

The invention discloses a method for strengthening the performance of a multiphase refractory material by pre-calcination-sintering microwave two-step method, which comprises the following steps: step 1, mixing and ball-milling ferronickel slag, sintered magnesia, and chromium trioxide to obtain a mixture, and then Magnesium chloride solution is added to the mixture, and then pressed to obtain green dough. After the green dough is dried, it is placed in a microwave reactor and pre-calcined at 1100-1250° C. for 5-40 minutes to obtain a pre-calcined billet. Step 2: Continue microwave sintering of the pre-calcined billet obtained in step 1 to obtain a multi-phase refractory material. The temperature of the microwave sintering is 1300-1350° C., and the temperature and time of the microwave sintering are ≤ 20 minutes. The invention obtains a compressive strength of 183.4-206.6MPa, a refractoriness of 1845-1873°C and a bulk density of 3.16-3.61g / cm 3 , A high-performance composite refractory material with an apparent porosity of 1.2% to 1.7%. The invention has many advantages such as high resource utilization rate, high product added value, low production cost, environmental friendliness and simple process.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a method for strengthening the performance of composite refractory materials by a precalcination-sintering microwave two-step method. Background technique [0002] Ferronickel slag is industrial solid waste slag discharged during the smelting process of nickel-iron alloy, and its discharge is affected by factors such as raw material type and treatment process. According to reports, an average of 6-16 tons of ferronickel slag is discharged for every ton of nickel alloy produced. With the rapid development of the stainless steel industry, ferronickel slag has become the fourth largest industrial smelting slag after iron slag, steel slag and red mud. At present, the stockpile of ferronickel slag in China is as high as 200 million tons, and the annual discharge is growing rapidly at 40 million tons. More than 90% of the slag is disposed of in stockpiles and landfills...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/138C04B35/66C04B35/622
CPCC04B33/138C04B35/66C04B35/622C04B2235/3206C04B2235/3241C04B2235/9607C04B2235/77C04B2235/96Y02P40/60
Inventor 彭志伟李光辉唐慧敏姜涛古佛全饶明军钟强罗骏张元波范晓慧郭宇峰杨永斌李骞尚文兴王捷
Owner CENT SOUTH UNIV
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